Structural, optical, dielectric, and magnetic properties of iron-sillenite Bi25FeO40

Jebari, H.; Tahiri, N.; Boujnah, M.; Bounagui, O. El; Boudad, L.; Taïbi, M.; Ez‐Zahraouy, H.

doi:10.1007/s00339-022-05973-4

Cited by 17 publications

(5 citation statements)

References 42 publications

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“…After the deconvolution of the recorded spectrum, the presence of three main bands located at 335 nm, 376 nm, and 468 nm was observed. The transitions of the bands from 376 nm to 468 nm, correlated with the data obtained by X-ray diffraction and FT-IR spectroscopy, indicate the occupation of the octahedral positions by the Bi 3+ ions and the tetrahedral positions by the Fe 3+ ions [ 76 ]. It is assumed that the band located at 335 nm can be attributed to Bi 3+ ions, which occupy a tetrahedral position.…”

Section: Resultsmentioning

confidence: 87%

“…It is known that the specific surface plays an essential role in the reaction yield as well as in the adsorption yield of certain compounds [ 76 ]. Therefore, knowing the essential role of the specific surface of the material, we can determine the roughness of the material on the analyzed area using atomic force microscopy, which is in close correlation with the data obtained at BET.…”

Section: Resultsmentioning

confidence: 99%

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Advanced Photocatalytic Degradation of Cytarabine from Pharmaceutical Wastewaters

Berbentea,

Ciopec,

Duteanu

et al. 2024

Toxics

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The need to develop advanced wastewater treatment techniques and their use has become a priority, the main goal being the efficient removal of pollutants, especially those of organic origin. This study presents the photo-degradation of a pharmaceutical wastewater containing Kabi cytarabine, using ultraviolet (UV) radiation, and a synthesized catalyst, a composite based on bismuth and iron oxides (BFO). The size of the bandgap was determined by UV spectroscopy, having a value of 2.27 eV. The specific surface was determined using the BET method, having a value of 0.7 m2 g−1. The material studied for the photo-degradation of cytarabine presents a remarkable photo-degradation efficiency of 97.9% for an initial concentration 0f 10 mg/L cytarabine Kabi when 0.15 g of material was used, during 120 min of interaction with UV radiation at 3 cm from the irradiation source. The material withstands five photo-degradation cycles with good results. At the same time, through this study, it was possible to establish that pyrimidine derivatives could be able to combat infections caused by Escherichia coli and Candida parapsilosis.

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Section: Resultsmentioning

confidence: 87%

Section: Resultsmentioning

confidence: 99%

Advanced Photocatalytic Degradation of Cytarabine from Pharmaceutical Wastewaters

Berbentea,

Ciopec,

Duteanu

et al. 2024

Toxics

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“…The XRD pattern of BFO (see Figure S2) confirms the formation of Bi 2 Fe 4 O 9 , characterized by an orthorhombic structure with the Pbam space group (JCPDS No. 25-0090). − Accordingly, the XRD peaks appearing at 22.3, 24.7, 33.6, 35.5, 37.5, 44.4, 45.6, 48.7, 59.1, 62.3, and 64.4 are assigned to (200), (021), (022), (212), (022), (140), (132), (141), (004), and (342) planes of Bi 2 Fe 4 O 9 , respectively. The diffractogram of CeO 2 /PPy/BFO NHs revealed the formation of Bi 2 Fe 4 O 9 (BFO) on CeO 2 /PPy at different time intervals (see Figure S3).…”

Section: Results and Discussionmentioning

confidence: 99%

Dual Active Site Mediated Photocatalytic H₂ Evolution through Water Splitting Using CeO₂/PPy/BFO Double Heterojunction Catalyst

Ghosh,

Pal,

Biswas

et al. 2024

ACS Appl. Energy Mater.

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Photocatalytic water splitting generates hydrogen from water and sunlight, but one bottleneck for widespread usage is the poor performance of semiconductor photocatalysts. Manipulating the surface of a catalytic material by introducing different components can tune phase composition and extend the catalytic activity by delayed charge recombination, superior charge transfer, and enhanced light harvesting. A double heterojunction has been fabricated using CeO 2 nanoparticles directly deposited on polypyrrole (PPy) nanofibers, and then Bi 2 Fe 4 O 9 (BFO) nanosheets were grown on CeO 2 /PPy with a significant improvement in visible light absorption. A high photocurrent density of 5.5 μA cm −2 with more negative Flat band potential (−0.47 V vs Ag/AgCl) has been obtained for CeO 2 /PPy/BFO compared to single heterojunction CeO 2 /PPy (∼1.9 μA cm −2 and −0.42 V vs Ag/AgCl). Lowering of charge transfer resistance (R ct ) values from 612 kΩ to 488 kΩ and 415 kΩ and longer charge carrier lifetimes of 4.8, 5.8, and 7.3 μs for CeO 2 , CeO 2 /PPy, and CeO 2 /PPy/BFO, respectively, imply facile charge carrier separation with enhanced interfacial band bending after construction of double heterojunctions. Remarkably, CeO 2 /PPy and CeO 2 /PPy/BFO demonstrated 32 and 71 times higher H 2 generation, respectively, than pure CeO 2 . Based on the possible band edge positions of semiconductors, a double heterojunction n-n-Z-scheme charge transfer pathway has been proposed. Our demonstration provides a paradigm to improve catalytic performance for water splitting through surface engineering of semiconductor photocatalysts.

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“…However, the presence of Bi 25-FeO 40 and Bi 2 Fe 4 O 9 phases causes high leakage current in the sample, resulting degradation in the ferroelectric behavior. Although, it is found that iron-sillenite Bi 25-FeO 40 is of great interest owing to its piezoelectric and electro-optic properties [5,6]. In order to improve the electrical properties, ABO 3 (i.e., A and B are cations, and O is an anion) perovskite compounds can be introduced.…”

Section: Introductionmentioning

confidence: 99%

Adiabatic small polaron hopping conduction in nanostructured Bi2O3–Fe2O3–PbTiO3 prepared by high energy planetary ball mill

El‐Desoky

Gazouly

Hannor

et al. 2023

J Mater Sci: Mater Electron

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Nanostructured 0.52 Bi2O3–0.18 Fe2O3–0.30 PbTiO3 (BFPT) mol% sample was prepared via a high-energy planetary ball mill. To obtain nanostructured materials, the mixture was mechanically milled for 1, 2, 5, and 25 h. The heat treating process was applied to the milled BFPT sample at 673, 873, and 1073 K for 5 h. The amorphous natures of the as-milled and crystallized formed phases of the heat treated samples are examined using the X-ray diffraction (XRD) technique. HRTEM and XRD were used to confirm the amorphous nature and nanocrystallization of the milled and the heat treated BFPT samples, respectively. The effect of the heat-treatment temperature of BFPT samples on their dc electrical conductivity (σ), density (ρ), and oxygen molar volume (Vm) was studied. The results of the thermoelectric power indicate a p-type semiconducting behavior of the BFPT samples. The high temperature (above θD/2) dependent on conductivity was explicated by the small polaron hopping (SPH) model. While Greaves’ variable range hopping (VRH) model was studied at intermediate temperatures. The physical parameters determined from the best fits of these models were thought to be reasonable and consistent with the BFPT samples. The hopping carrier mobility was found to be the dominant factor for determining the conductivity in the BFPT samples. The electronic transport between Fe ions was primarily responsible for the conduction, which was shown to obey the adiabatic SPH.

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Structural, optical, dielectric, and magnetic properties of iron-sillenite Bi25FeO40

Cited by 17 publications

References 42 publications

Advanced Photocatalytic Degradation of Cytarabine from Pharmaceutical Wastewaters

Advanced Photocatalytic Degradation of Cytarabine from Pharmaceutical Wastewaters

Dual Active Site Mediated Photocatalytic H₂ Evolution through Water Splitting Using CeO₂/PPy/BFO Double Heterojunction Catalyst

Adiabatic small polaron hopping conduction in nanostructured Bi2O3–Fe2O3–PbTiO3 prepared by high energy planetary ball mill

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Structural, optical, dielectric, and magnetic properties of iron-sillenite Bi25FeO40

Cited by 17 publications

References 42 publications

Advanced Photocatalytic Degradation of Cytarabine from Pharmaceutical Wastewaters

Advanced Photocatalytic Degradation of Cytarabine from Pharmaceutical Wastewaters

Dual Active Site Mediated Photocatalytic H2 Evolution through Water Splitting Using CeO2/PPy/BFO Double Heterojunction Catalyst

Adiabatic small polaron hopping conduction in nanostructured Bi2O3–Fe2O3–PbTiO3 prepared by high energy planetary ball mill

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Product

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Dual Active Site Mediated Photocatalytic H₂ Evolution through Water Splitting Using CeO₂/PPy/BFO Double Heterojunction Catalyst